Wire-like metallic material and method for producing the same

Abstract

To provide wire-like metallic material in which crystal orientation is controlled in the vicinity of a surface and which has excellent magnetic properties, and to provide a method for producing the same.SOLUTION: Wire-like metallic material is composed of pure iron or an iron alloy having a body-centered cubic lattice structure or a body-centered tetragonal lattice structure as a crystal structure. In the wire-like metallic material, a <001> direction of a crystal is oriented substantially parallel to a normal direction of a surface of the wire-like metallic material in a surface vicinity region which is at least a partial region including a surface of the wire-like metallic material in a region from a surface of the wire-like metallic material to depth of 50 μm.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a wire-shaped metallic material and a method for producing the same. [Background technology]

[0002] One of the electromagnetic components used in automobiles is a hydraulic control solenoid. In this solenoid, a magnetized plunger is attracted to the inside of the coil when a current is applied to the coil. The oil flow rate is controlled by driving the plunger, but the attractive force of the iron core (which is the plunger) must respond quickly to the control current, so the iron core is required to have excellent magnetic properties. For example, Patent Document 1 discloses a solenoid equipped with an iron core with excellent iron loss. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-121229 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, pure iron-based soft magnetic wire has been used as the iron core material for solenoids. However, while solenoid iron cores made from pure iron-based soft magnetic wire exhibit good iron loss when used with direct current, they are not suitable for use with alternating current, which has seen increasing demand in recent years. Therefore, there is a demand for iron core materials that have good iron loss even when used with alternating current.

[0005] The present invention provides a wire-shaped metallic material having controlled crystal orientation near the surface and excellent magnetic properties, and a method for producing the same. [Means for solving the problem]

[0006] The wire-shaped metal material according to one embodiment of the present invention is made of pure iron or iron alloy having a body-centered cubic lattice structure or a body-centered tetragonal lattice structure. The wire-shaped metal material has a crystal structure in a near-surface region, which is at least a part of the region including the surface of the wire-shaped metal material, from the surface to a depth of 50 μm. <001> The direction is oriented approximately parallel to the normal direction of the surface of the wire-shaped metal material.

[0007] The wire-shaped metal material is made of pure iron or an iron alloy having a crystal structure of a body-centered cubic lattice structure or a body-centered tetragonal lattice structure, and has an easy magnetization axis of the crystal in the surface vicinity region. <001> The direction of the wire-shaped metal material is oriented approximately parallel to the normal direction, which is the direction perpendicular to the surface of the wire-shaped metal material. This reduces iron loss and improves magnetic properties. This makes it applicable as a material for constructing electromagnetic components, such as iron cores of solenoids. In particular, when applied to solenoid iron cores, the material exhibits superior magnetic properties in the high frequency band compared to conventional solenoid iron cores.

[0008] Furthermore, the crystal orientation of the wire-shaped metal material is controlled in the near-surface region, which is at least a portion of the region extending from the surface to a depth of 50 μm, including the surface. For example, when an AC magnetic field with a frequency of 2 kHz or higher is applied to the wire-shaped metal material, the magnetic field is easily affected from the surface to a depth of approximately 50 μm. Therefore, by controlling the crystal orientation in the near-surface region, which is easily affected by the AC magnetic field, the iron loss in AC is reduced. This makes it applicable as a material with good iron loss for AC as well as DC.

[0009] The wire-shaped metal material may have a plastic deformability of 50% or more. In this case, because of its excellent plastic deformability, cracks are unlikely to occur during plastic deformation, and even if cracks do occur during plastic deformation, the cracks are unlikely to propagate. This makes the wire-shaped metal material suitable, for example, as a material for constituting the iron core of a solenoid manufactured by plastic deformation. In other words, as automobile parts have become smaller and more complex in shape in recent years, solenoids have also become smaller and more complex in shape. Therefore, by having excellent plastic deformability, it is possible to achieve smaller solenoids with more complex shapes.

[0010] In addition, in measuring the crystal orientation distribution in the surface vicinity region of the wire-shaped metal material, <001> The crystal orientation distribution may have at least one peak detected between 0° and 15° from the normal direction, which has a higher intensity than the group of peaks formed between 75° and 105° from the normal direction. In this case, the crystal may have an easy axis of magnetization. <001> The direction can be controlled to a predetermined direction, thereby improving the magnetic properties.

[0011] In addition, in the above measurement, <111> The crystal orientation distribution may have peaks formed between 0° and 15° from the normal direction and between 39° and 85° from the normal direction. In this case, the hard axis of the crystal is <111> The direction can be controlled to a predetermined direction, thereby improving the magnetic properties.

[0012] The wire-shaped metal material may be made of a pure iron-based soft magnetic material, which can further improve the magnetic properties.

[0013] Another embodiment of the present invention is a method for producing a wire-shaped metal material, which comprises projecting a shot material onto the surface of a wire-shaped metal material made of pure iron or an iron alloy having a crystal structure of a body-centered cubic lattice structure or a body-centered tetragonal lattice structure, and forming a crystal structure in a near-surface region, which is at least a part of the region including the surface of the wire-shaped metal material, within a region from the surface of the wire-shaped metal material to a depth of 50 μm. <001> The wire-shaped metal material is subjected to a surface processing treatment in which the direction of the metal grains is oriented approximately parallel to the normal direction of the surface of the wire-shaped metal material.

[0014] According to the method for producing the wire-shaped metal material, the projection material is projected onto the surface of the wire-shaped metal material to perform surface processing, so that the axis of easy magnetization of the crystal in the surface vicinity region is aligned. <001> The direction of the crystal grains is oriented approximately parallel to the normal direction, which is the direction perpendicular to the surface of the wire-shaped metal material. This controls the crystal orientation near the surface, making it easy to obtain a wire-shaped metal material with excellent magnetic properties. Furthermore, since the surface processing treatment generates residual compressive stress on the processed surface of the wire-shaped metal material, the obtained wire-shaped metal material has excellent plastic deformability.

[0015] In the method for producing the wire-shaped metal material, at least one of the projection pressure and projection time of the projection material in the surface processing treatment is adjusted, and the crystals in the surface near-surface region of the wire-shaped metal material are <001> In this case, the orientation of the direction of the easy axis of magnetization of the crystal in the vicinity of the surface of the wire-shaped metallic material may be controlled. <001> The direction can be controlled precisely in a predetermined direction.

[0016] Furthermore, after the surface treatment of the wire-shaped metal material, it may be further subjected to heat treatment. In this case, the easy axis of magnetization of the crystal in the vicinity of the surface of the wire-shaped metal material is aligned. <001> The direction can be precisely controlled in a predetermined direction. Furthermore, heat treatment can remove distortion, reduce electrical resistance, and improve saturation magnetization. As a result, the magnetic properties near the surface can be further improved.

[0017] An electromagnetic component according to yet another embodiment of the present invention uses the above-described wire-shaped metal material at least in part, and since the wire-shaped metal material has excellent magnetic properties, the performance of the electromagnetic component, particularly the magnetic properties, can be improved. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram of wet blasting in an embodiment. [Figure 2] 1 shows inverse pole figure (IPF) maps obtained by electron backscatter diffraction (EBSD) for sample A1 and sample B1 of the example. [Figure 3] 1 shows (001) and (111) pole figures obtained by electron backscatter diffraction (EBSD) for Sample A1 and Sample B1 of the example. [Figure 4] 1 shows inverse pole figure (IPF) maps obtained by electron backscatter diffraction (EBSD) for sample A2 and sample B2 of the example. [Figure 5] 1 shows (001) and (111) pole figures obtained by electron backscatter diffraction (EBSD) for sample A2 and sample B2 of the example. [Figure 6] 1 shows photographs of the appearance of Sample A1 and Sample B1 of the example when a compressive strain of 80% is introduced. [Figure 7] 1 shows stress-strain curves of Sample A1 and Sample B1 of the example when they are compressed to a compressive strain of 80%. [Figure 8] 1 is a photograph showing a sample for measuring AC magnetic properties, to which an excitation coil and a detection coil are attached, in an example. [Figure 9] 1 shows BH curves obtained in an example at applied frequencies of (A) 1 MHz, (B) 2 MHz, and (C) 3 MHz. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described.

[0020] [Wire-shaped metal material] First, the wire-shaped metal material will be described. The wire-shaped metal material is composed of pure iron or an iron alloy having a body-centered cubic lattice structure or a body-centered tetragonal lattice structure as its crystal structure. Examples of the pure iron include pure iron-based soft magnetic materials. Examples of the iron alloy include carbon steel (an alloy of iron and carbon) and iron-silicon alloys.

[0021] The wire-shaped metal material is formed in a wire (linear) shape. Wire-shaped metal materials can have a cross section that is circular, elliptical, triangular, rectangular, hexagonal, or other polygonal shape, as well as a variety of other shapes (including so-called irregularly shaped materials). The wire-shaped metal material can be formed, for example, by drawing a metal into a wire shape, or by processing a metal into an elongated wire shape by cutting or the like. The wire-shaped metal material may have the same diameter in the axial direction, or the diameter may vary in parts. For example, it may have a part whose diameter is different from the other parts, or it may have a part whose diameter gradually changes (expands or contracts).

[0022] The wire-shaped metal material has a crystal structure in a near-surface region, which is at least a part of the region from the surface of the wire-shaped metal material to a depth of 50 μm, including the surface of the wire-shaped metal material. <001> The direction is oriented approximately parallel to the normal direction of the surface (outer peripheral surface) of the wire-shaped metal material. Here, of the region from the surface of the wire-shaped metal material to a depth of 50 μm, at least a portion of the region including the surface of the wire-shaped metal material (surface near region) may be, for example, a region from the surface of the wire-shaped metal material to a depth of 10 μm, a region from the surface of the wire-shaped metal material to a depth of 25 μm, or a region from the surface of the wire-shaped metal material to a depth of 50 μm.

[0023] As described above, the wire-shaped metal material has a crystalline structure in the surface vicinity region of the wire-shaped metal material. <001> The direction is oriented approximately parallel to the normal direction. <001> This means that the direction is controlled to be tilted at an angle of 0° to 15° with respect to the normal direction. Note that a tilt of 0° means that the direction is the same as (parallel to) the normal direction.

[0024] The alignment of the crystal orientation near the surface of the wire-shaped metal material can be confirmed, for example, by measuring the crystal orientation distribution near the surface of the wire-shaped metal material. The crystal orientation distribution can be measured using, for example, electron backscatter diffraction (EBSD), which is suitable for measuring a local area, or X-ray diffraction (XRD), which is suitable for measuring a wide area.

[0025] In measuring the crystal orientation distribution in the surface area of ​​wire-shaped metal materials, <001> The crystal orientation distribution may have at least one peak detected between 0° and 15° from the normal direction, the peak having a higher intensity than the group of peaks formed between 75° and 105° from the normal direction. <001> Crystals whose orientation is between 0° and 15° from the normal direction are different from other <001> Therefore, the crystal orientation is between 0° and 15° from the normal direction and between 75° and 105° from the normal direction. <001> A peak in the direction is formed.

[0026] In measuring the crystal orientation distribution in the surface area of ​​wire-shaped metal materials, <111> The crystal orientation distribution may have peaks detected in the direction between 0° and 15° from the normal direction and between 39° and 85° from the normal direction. <111> Crystals whose orientation is between 0° and 15° from the normal direction are considered to be another <111> The direction is 55° to 85° from the normal direction. <001> Crystals whose orientation is 0° to 15° from the normal direction are <111> Therefore, the crystal orientation is between 0° and 15° from the normal direction and between 39° and 85° from the normal direction. <111> A peak in the direction is formed.

[0027] The wire-shaped metal material preferably has a plastic deformability of 50% or more, and more preferably 80% or more. For example, a plastic deformability of 50% or more means that a nominal strain of 50% or more can be plastically deformed in a compression test. If the plastic deformability is 50% or more, the wire is more susceptible to plastic deformation than conventional carbon steel wires, etc. The plastic deformability can be evaluated by performing a compression test using a tension-compression testing machine.

[0028] Wire-shaped metal materials are used in at least a portion of electromagnetic components. Examples of electromagnetic components include solenoids, electromagnetic brakes, electromagnetic clutches, reed switches, relays, and alternators. Specifically, wire-shaped metal materials are used in, for example, solenoid plungers, stationary cores, and solenoid covers, electromagnetic clutch armatures and yokes, and alternator rotors. Here, "wire-shaped metal materials" refers to the use of wire-shaped metal materials as they are, or to the use of processed products obtained by subjecting wire-shaped metal materials to processing such as cold forging and cutting within a range that does not impair their functions and characteristics. Furthermore, examples of shapes that can be used in electromagnetic components include cylindrical and cup shapes.

[0029] [Method of manufacturing wire-shaped metal material] Next, a method for producing a wire-shaped metallic material will be described. The method for manufacturing the wire-shaped metal material involves projecting a shot material onto the surface of the wire-shaped metal material to perform a surface treatment.

[0030] The surface treatment can be performed by projecting a shot material onto the surface of the wire-shaped metal material and colliding the shot material with the surface of the wire-shaped metal material at high speed. Examples of such surface treatment methods include shot peening, shot blasting, and wet blasting. Wet blasting is particularly preferred because it produces smaller surface undulations after processing and a smaller temperature rise during processing compared to other surface treatment methods. In other words, reducing the surface undulations that hinder domain wall motion can further reduce iron loss, a magnetic property. Furthermore, because surface undulations can also be a source of crack generation, reducing the surface undulations can further improve plastic deformability. Furthermore, suppressing the temperature rise during processing can suppress softening and the generation of new crystal grains due to heat generation during processing, facilitating crystal orientation control through plastic deformation alone, thereby further improving plastic deformability.

[0031] The material of the shot material used in the surface treatment can be appropriately selected depending on the material of the wire-shaped metal material to be shot and hit, etc. Examples of the shot material that can be used include metal particles such as cast iron, carbon steel, stainless steel, and tungsten, and hard oxide particles such as alumina particles and zirconia particles.

[0032] The conditions for the surface processing treatment can be adjusted as appropriate. For example, the projection pressure of the projection material, the projection time, the distance between the surface of the wire-shaped metal material and the projection nozzle that projects the projection material, etc. can be adjusted. The orientation state of the crystal orientation near the surface of the wire-shaped metal material can be controlled by adjusting the projection pressure and projection time of the projection material.

[0033] Furthermore, after the above-mentioned surface processing treatment is performed on the wire-shaped metal material, it may be further subjected to a heat treatment. In the heat treatment, the wire-shaped metal material is heated to a predetermined temperature and held for a predetermined time. The conditions of the heat treatment can be appropriately adjusted, such as the heating temperature and holding time. By adjusting the conditions of the heat treatment, the crystal orientation near the surface of the wire-shaped metal material can be precisely controlled.

[0034] The heating temperature in the heat treatment can be, for example, 400° C. to 910° C., and particularly 700° C. to 900° C. This allows the crystal orientation near the surface of the wire-shaped metallic material to be controlled with high precision.

[0035] The holding time (heating time) in the heat treatment can be, for example, 0.5 to 5 hours. The holding time in the heat treatment can be adjusted appropriately depending on the material of the wire-shaped metal material, etc., in order to accurately control the crystal orientation in the vicinity of the surface of the wire-shaped metal material.

[0036] The present invention will be described below with reference to examples.

[0037] (Example) <Crystal orientation distribution after wet blasting> First, the samples were prepared. Specifically, wet blasting was performed on iron wire made of a pure iron-based soft magnetic material with a diameter of 10 mm and iron wire made of carbon steel (S10C) with a diameter of 12 mm. The crystal structures of both the pure iron-based soft magnetic material and the carbon steel are body-centered cubic lattice structures. The iron wires were also prepared by drawing various metals.

[0038] Figure 1 is a schematic diagram showing the wet blasting of iron wire 1 with a circular cross section. In wet blasting, a mixture of hard particles 2 as a projectile material and liquid water W is sprayed from a spray nozzle using compressed air, causing the hard particles 2 to collide with the surface (outer periphery) of the sample, thereby performing surface processing. A conventionally known wet blasting device can be used for wet blasting, and the conditions can be changed as appropriate. Here, wet blasting was performed using a wet blasting device to the extent that undulations were created on the processed surface (blasted surface). The wet-blasted iron wire made of a pure iron-based soft magnetic material is designated as sample A1, and the iron wire made of carbon steel is designated as sample B1.

[0039] Next, samples A1 and B1 were polished approximately 10 μm inward from the processed surface, and the crystal orientation distribution of the polished surface (internal processed surface) was analyzed using a scanning electron microscope equipped with an electron backscatter diffraction (EBSD) detector (TSL, OIM Data Collection 7).

[0040] Figure 2 is an inverse pole figure (IPF) map obtained by EBSD, showing the crystal orientation distribution on the surface of the sample. The wire axis direction, which is the axial direction of the iron wire, is shown in the figure. For both samples, the crystal grains are found to be fine on the internal machined surface, approximately 10 μm from the machined surface, indicating that large plastic deformation has occurred.

[0041] Figure 3 shows the crystal structure of the internally machined surfaces of specimens A1 and B1 obtained by EBSD. <001> Direction and <111> The (001) and (111) pole figures show the crystal orientation distribution in the direction.

[0042] From the pole figure in Figure 3, as shown in the schematic diagram at the bottom right of Figure 3, the easy axis of magnetization of Fe is <001> It can be seen that the orientation distribution is strong, with the direction of the iron wire being approximately parallel to the normal direction of the processed surface. Here, the normal direction of the processed surface is the direction perpendicular to the surface of the iron wire (normal direction), and since the cross section of the iron wire is circular, it is approximately the same direction as the radial direction of the iron wire. In addition, the easy axis of magnetization <001> The direction is oriented approximately parallel to the normal direction of the processed surface, and <001> It can be seen that the direction of the magnetization is randomly distributed within the processed surface. <001> The peak of the highest intensity in the direction is strongly oriented between 0° and 15° from the normal direction of the processed surface, specifically at a position that forms an angle of about 11° with the normal direction of the processed surface. <001> The orientation is strongly distributed randomly in the direction between 75° and 105° from the normal direction of the processed surface, specifically between approximately 79° and 101° from the normal direction of the processed surface.

[0043] moreover, <001> Although it is slightly smaller than the direction, it is the hard axis of magnetization. <111> The direction, <001> It can be seen that the orientation is weakly parallel to the normal direction of the processed surface, similar to the direction of the hard magnetization. <111> The peaks in the direction are formed between 0° and 15° from the normal direction of the processed surface and between 39° and 85° from the normal direction of the processed surface.

[0044] <Effects of heat treatment after wet blasting> Next, the wet-blasted samples A1 and B1 were subjected to heat treatment, and changes in the crystal orientation distribution were confirmed.

[0045] Specifically, the wet-blasted samples A1 and B1 were heated to 850°C in a vacuum and held there for three hours. They were then slowly cooled from 850°C to 500°C and held at 500°C for 0.5 hours. They were then rapidly cooled from 500°C in argon gas. In this way, samples A2 and B2 were produced by subjecting samples A1 and B1 to heat treatment.

[0046] Next, the heat-treated samples A2 and B2 were polished to within 10 μm from the processed surface, and the polished surface (internal processed surface) was analyzed using a scanning electron microscope equipped with an EBSD detector.

[0047] Figure 4 is an inverse pole figure (IPF) map obtained by EBSD, showing the crystal orientation distribution on the surface of the sample. The wire axis direction, which is the axial direction of the iron wire, is shown in the figure. In both samples, recrystallization and coarsening have occurred on the internal machined surface, approximately 10 μm inside the machined surface of the sample, and it can be seen that the crystal grains have become larger.

[0048] Figure 5 shows the crystal structure of the internally machined surfaces of specimens A2 and B2 obtained by EBSD. <001> Direction and <111> The (001) pole figure and the (111) pole figure show the crystal orientation distribution of the direction. From the pole figures in FIG. 5, it can be seen that the magnetically easy axis is also present in the heat-treated samples A2 and B2. <001> The direction is approximately parallel to the normal direction of the processed surface and <001> It can be seen that the orientation is strongly distributed so that the direction is random within the processed surface.

[0049] <Evaluation of plastic deformability through compression testing> Figure 6 shows photographs (top and side views) of specimens A1 and B1, which were compressively deformed to 80% of their nominal strain. The direction of the iron wire's compression axis is indicated in the figure. The compression speed in the compression test was 10 mm / min. The top and side views show that deformation to 80% of the nominal strain was achieved without cracking. For example, when compressively deforming carbon steel (S10C) that has not been wet-blasted, cracks typically occur at a plastic strain of approximately 50% of the nominal strain. However, wet-blasting can achieve plastic deformation of more than 80% of the nominal strain. This is presumably because wet-blasting generates compressive residual stress on the material surface, which suppresses the initiation and propagation of cracks.

[0050] Figure 7 shows the stress-strain curves obtained when specimens A1 and B1 were compressed to 80% of their nominal strain. As can be seen from this graph, both specimens A1 and B1 were able to be compressed to 80% of their nominal strain without a reduction in stress, which would indicate the occurrence of cracks. Therefore, by wet blasting the iron wire, the plastic deformability of the iron wire can be improved to 80% or more.

[0051] <Evaluation of improvement in magnetic properties by wet blasting> First, a sample was prepared. Specifically, a 10 mm diameter iron wire made of carbon steel (S10C) was wet-blasted using a wet-blasting device. Next, as a heat treatment, the temperature was raised to 850°C in a vacuum and held there for 3 hours. Then, the sample was slowly cooled from 850°C to 500°C and held at 500°C for 0.5 hours. After that, it was cooled from 500°C. In this way, a sample that had been wet-blasted and heat-treated was prepared. Furthermore, for comparison, a 10 mm diameter iron wire made of carbon steel (S10C) similar to the above was not wet-blasted but was heat-treated under the same heat treatment conditions as the above. In this way, a sample that had been heat-treated only was prepared.

[0052] Next, the AC magnetic properties of the two samples were evaluated. Specifically, a cylindrical sample with a diameter of 10 mm and a length of 5 mm was machined with an axial through-hole with an inner diameter of 6 mm by electrical discharge machining to prepare a sample for measuring AC magnetic properties. Then, as shown in Figure 8, an excitation coil and a detection coil were attached to the measurement sample. Each coil had five turns. The BH curve, iron loss, and amplitude ratio permeability were then measured using an AC magnetic measurement device (Iwasaki Electric Co., Ltd., Magnetic Flux Density (B)-Magnetizing Force (H) Analyzer). The applied magnetic flux density was 15 mT, and the applied frequencies were 1 MHz, 2 MHz, and 3 MHz.

[0053] 9(A) to 9(C) show the BH curves obtained for each sample at an applied magnetic flux density of 15 mT. At applied frequencies of 1 MHz, 2 MHz, and 3 MHz, the samples that underwent wet blasting and heat treatment reached the applied magnetic flux density of 15 mT with a smaller magnetizing force than the samples that were only subjected to heat treatment without wet blasting. In other words, it can be said that the samples that underwent wet blasting are easier to magnetize than the samples that were not subjected to wet blasting.

[0054] Table 1 shows the iron loss and amplitude relative permeability of each sample. Table 1 shows that at applied frequencies of 1 MHz, 2 MHz, and 3 MHz (compared at the same applied frequency), the iron loss of the wet-blasted and heat-treated samples is lower than that of the heat-treated samples without wet-blasting. Because iron loss represents the energy loss during the conversion of electrical energy to magnetic energy, it can be said that the wet-blasted samples have lower energy loss and superior magnetic properties. Furthermore, it can be seen that the amplitude relative permeability of the wet-blasted and heat-treated samples is higher than that of the heat-treated samples without wet-blasting. Because relative permeability represents the ease of magnetization, it can be said that the wet-blasted samples are easier to magnetize.

[0055] [Table 1]

[0056] (Other embodiments) The present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be embodied in various forms without departing from the scope of the present invention.

[0057] (1) In the above-described embodiment, iron wires made of pure iron-based soft magnetic material and iron wires made of carbon steel are used as the wire-shaped metallic material, but other types of wire-shaped metallic material may also be used.

[0058] (2) In the above examples, wet blasting was used as the surface treatment method, but other methods such as shot peening and shot blasting may also be used. In these cases, the same effects as when wet blasting is used for surface treatment can be obtained.

[0059] (3) In the above examples, examples in which surface processing was performed (samples A1 and B1) and examples in which heat treatment was performed after surface processing (samples A2 and B2) were described. However, heat treatment is not necessarily required and may be performed as needed.

[0060] (4) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. All aspects included in the technical idea identified by the wording of the claims are embodiments of the present invention. [Explanation of symbols]

[0061] 1...Iron wire, 2...Hard particles, W...Water

Claims

1. A wire-shaped metal material, The crystal structure is composed of pure iron or an iron alloy having a body-centered cubic lattice structure or a body-centered tetragonal lattice structure, In a surface near-surface region, which is at least a part of the region including the surface of the wire-shaped metal material within a region from the surface of the wire-shaped metal material to a depth of 50 μm, the <001> direction of the crystal is oriented approximately parallel to the normal direction of the surface of the wire-shaped metal material. Wire-shaped metal material.

2. The wire-shaped metallic material according to claim 1, wherein the wire-shaped metallic material has a plastic deformability of 50% or more.

3. 2. The wire-shaped metal material according to claim 1, wherein, in a measurement of the crystal orientation distribution in the near-surface region of the wire-shaped metal material, at least one peak having a higher intensity than the group of peaks formed between 75° and 105° from the normal direction is detected between 0° and 15° from the normal direction in the <001> direction of the crystal.

4. 4. The wire-shaped metal material according to claim 3, wherein the measurement has a crystal orientation distribution in which peak groups formed between 0° and 15° from the normal direction and between 39° and 85° from the normal direction are detected for the <111> direction of the crystal.

5. 2. The wire-shaped metal material according to claim 1, wherein the wire-shaped metal material is made of a pure iron-based soft magnetic material.

6. A method for producing a wire-shaped metal material, a projection material is projected onto the surface of a wire-shaped metal material made of pure iron or an iron alloy having a crystal structure of a body-centered cubic lattice structure or a body-centered tetragonal lattice structure, and a surface processing treatment is performed in which the <001> direction of the crystal is oriented approximately parallel to the normal direction to the surface of the wire-shaped metal material in a near-surface region, which is at least a portion of a region including the surface of the wire-shaped metal material, within a region from the surface to a depth of 50 μm of the wire-shaped metal material; A method for manufacturing a wire-shaped metal material.

7. 7. The method for producing a wire-shaped metal material according to claim 6, wherein at least one of the projection pressure and projection time of the projection material in the surface processing treatment is adjusted to control the orientation state of the crystals in the <001> direction in the surface near region of the wire-shaped metal material.

8. The method for producing a wire-shaped metal material according to claim 6, further comprising the step of subjecting the wire-shaped metal material to the surface treatment and then to a heat treatment.

9. An electromagnetic component, at least a part of which uses the wire-shaped metallic material according to any one of claims 1 to 5.

Images